3B Scientific Electrometer (115 V, 50__60 Hz) - Manual (Page 7)

Elwe Didactic GmbH • Steinfelsstr. 6 • 08248 Klingenthal • Germany • www.elwedidactic.com
3B Scientific GmbH • Rudorffweg 8 • 21031 Hamburg • Germany • www.3bscientific.com
Technical amendments are possible
© Copyright 2008 3B Scientific GmbH
charge is within, and “wipe” the charge onto the
inner surface of the cup.
• Use the relationships given below to calculate the
charge that has been transferred.
• For a capacitor of capacitance C, the relationship
between the charge Q and the voltage U is:
U C Q
⋅ =
• Since U
OUT
= U
IN
, the output voltage from the
electrometer gives a measure of the charge Q:
C U Q
OUT
⋅ =
• The capacitor U8403501 has the known capacitance
C = 10
nF, and therefore the charge can be
calculated.
Fig. 1 Experiment set-up for measuring charges in electrostatics